Clock



FIG. 1 is a bottom, right front perspective view of a clock showing my new design:

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a right side elevational view, the left side being a mirror image thereof; and,

FIG. 5 is a top plan view, the bottom plan view being a mirror image thereof. 

CLAIM The ornamental design for a clock, as shown and described. 